<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/react.development.js"></script>
    <script src="../js/react-dom.development.js"></script>
    <script src="../js/babel.min.js"></script>
</head>

<body>
    <div id="root"></div>
    <script type="text/babel">
        var n = 0;
        function test() {
            const element = (
                <div>
                    <h1>Hello World</h1>
                    <h1>test() run {++n} time</h1>
                </div>
            );
            ReactDOM.render(element, document.getElementById('root'));
        }
        // 设置定时器进行循环
        setInterval(test, 1000)
    </script>
</body>

</html>